graphql-php/src/Deferred.php

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<?php
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declare(strict_types=1);
namespace GraphQL;
use GraphQL\Executor\Promise\Adapter\SyncPromise;
class Deferred
{
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/** @var \SplQueue */
private static $queue;
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/** @var callable */
private $callback;
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/** @var SyncPromise */
public $promise;
public static function getQueue()
{
return self::$queue ?: self::$queue = new \SplQueue();
}
public static function runQueue()
{
$q = self::$queue;
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while ($q && ! $q->isEmpty()) {
/** @var self $dfd */
$dfd = $q->dequeue();
$dfd->run();
}
}
public function __construct(callable $callback)
{
$this->callback = $callback;
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$this->promise = new SyncPromise();
self::getQueue()->enqueue($this);
}
public function then($onFulfilled = null, $onRejected = null)
{
return $this->promise->then($onFulfilled, $onRejected);
}
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public function run() : void
{
try {
$cb = $this->callback;
$this->promise->resolve($cb());
} catch (\Exception $e) {
$this->promise->reject($e);
} catch (\Throwable $e) {
$this->promise->reject($e);
}
}
}